According to recently released data from the analytics firm, comScore, Apple and Samsung both continued their race for U.S. smartphone subscribers over the fourth quarter of 2012. Apple’s iOS platform even managed to gain some ground on Google’s Android platform during the same time frame.

Data from comScore’s MobiLens service shows that the iPhone maintained its dominance of the U.S. smartphone market for the three months ending in December, bumping its share 2% from the previous quarter to account for 36.3% of all subscribers. Samsung saw the largest positive change over the fourth quarter, capturing 21% of the overall market, which is up 2.3% quarter-to-quarter. Trailing both Apple and Samsung were HTC and Motorola, both of which suffered declines to end the year with respective market shares of 10.2% and 9.1%.

The study found that Android retained its number one spot when it came to mobile platforms, with the mobile operating system running on over half of all smartphones in the U.S. Apple’s iOS made the greatest quarterly gains, however moving from 34.3% share at the end of September to 36.3% by year’s end. In comparison, Android saw a 0.9% change, upping its share from 52.5% to 53.4% over the same period. BlackBerry saw the biggest drop, falling 2% from 8.4% to end the quarter with a market share of 6.4%. The company, which recently changed its name from Research in Motion to Blackberry, released the Z10 on Wednesday. The device is the first handset in the company’s next-generation smartphone, which will be making its way to the U.S. in the middle of March.

According to comScore, 125.9 million people in the U.S. owned smartphones during the three months ending in December, which equated to 54% of all mobile phone subscribers in the country.